Animals are color blind, they notice movement the most.. but few people can hold perfectly still unless taught to do so in the military, and how to camo themselves...

Camo clothers and rifles are sort of useless, no matter how cool they can look...

during WW2, all pilots who flew observation planes or had observers to do that job, were all color blind.. they were chosen for that job, because what was hidden to folks with normal color vision, was not optically hidden for folks who were color blind....

so to keep yourself hidden from game, you need to be able to hide yourself, behind something or within something where you can see out well, and the animals can't see in very well...
doesn't matter if you dress like Elmer Fudd or John Rambo...

mask your smell, your movements and your outline...

like guys who are riding horses during elk hunting, when they see elk, they dismount and walk on the off side of the horse away from the elk... the elk can see the horse has 6 legs instead of the usual 4... but at the time they don't notice because as I once read wisely said.. elk don't know nor can they count, if a horse had 6 legs or only 4...